"use client";

import { useState } from "react";
import type { TeamMember, User } from "@mosaic/shared";
import { TeamMemberRole } from "@mosaic/shared";
import { Card, CardHeader, CardContent, Button, Select, Avatar } from "@mosaic/ui";

interface TeamMemberWithUser extends TeamMember {
  user: User;
}

interface TeamMemberListProps {
  members: TeamMemberWithUser[];
  onAddMember: (userId: string, role?: TeamMemberRole) => Promise<void>;
  onRemoveMember: (userId: string) => Promise<void>;
  availableUsers?: User[];
}

const roleOptions = [
  { value: TeamMemberRole.MEMBER, label: "Member" },
  { value: TeamMemberRole.ADMIN, label: "Admin" },
  { value: TeamMemberRole.OWNER, label: "Owner" },
];

export function TeamMemberList({
  members,
  onAddMember,
  onRemoveMember,
  availableUsers = [],
}: TeamMemberListProps): React.JSX.Element {
  const [isAdding, setIsAdding] = useState(false);
  const [selectedUserId, setSelectedUserId] = useState("");
  const [selectedRole, setSelectedRole] = useState(TeamMemberRole.MEMBER);
  const [removingUserId, setRemovingUserId] = useState<string | null>(null);

  const handleAddMember = async (): Promise<void> => {
    if (!selectedUserId) return;

    setIsAdding(true);
    try {
      await onAddMember(selectedUserId, selectedRole);
      setSelectedUserId("");
      setSelectedRole(TeamMemberRole.MEMBER);
    } catch (error) {
      console.error("Failed to add member:", error);
      alert("Failed to add member. Please try again.");
    } finally {
      setIsAdding(false);
    }
  };

  const handleRemoveMember = async (userId: string): Promise<void> => {
    setRemovingUserId(userId);
    try {
      await onRemoveMember(userId);
    } catch (error) {
      console.error("Failed to remove member:", error);
      alert("Failed to remove member. Please try again.");
    } finally {
      setRemovingUserId(null);
    }
  };

  const memberUserIds = new Set(members.map((m) => m.userId));
  const usersToAdd = availableUsers.filter((user) => !memberUserIds.has(user.id));

  return (
    <Card>
      <CardHeader>
        <div className="flex items-center justify-between">
          <h2 className="text-xl font-semibold text-gray-900">Team Members</h2>
          <span className="text-sm text-gray-500">
            {members.length} member{members.length !== 1 ? "s" : ""}
          </span>
        </div>
      </CardHeader>
      <CardContent>
        {/* Member list */}
        <div className="space-y-3 mb-6">
          {members.length === 0 ? (
            <p className="text-center text-gray-500 py-4">No members yet</p>
          ) : (
            members.map((member) => (
              <div
                key={member.userId}
                className="flex items-center justify-between p-3 bg-gray-50 rounded-lg"
              >
                <div className="flex items-center gap-3">
                  <Avatar
                    src={member.user.image ?? ""}
                    alt={member.user.name}
                    fallback={member.user.name.charAt(0).toUpperCase()}
                  />
                  <div>
                    <p className="font-medium text-gray-900">{member.user.name}</p>
                    <p className="text-sm text-gray-500">{member.user.email}</p>
                  </div>
                </div>
                <div className="flex items-center gap-2">
                  <span
                    className={`px-3 py-1 text-xs font-medium rounded-full ${
                      member.role === TeamMemberRole.OWNER
                        ? "bg-purple-100 text-purple-700"
                        : member.role === TeamMemberRole.ADMIN
                          ? "bg-blue-100 text-blue-700"
                          : "bg-gray-100 text-gray-700"
                    }`}
                  >
                    {member.role}
                  </span>
                  {member.role !== TeamMemberRole.OWNER && (
                    <Button
                      variant="danger"
                      size="sm"
                      onClick={() => handleRemoveMember(member.userId)}
                      disabled={removingUserId === member.userId}
                    >
                      {removingUserId === member.userId ? "Removing..." : "Remove"}
                    </Button>
                  )}
                </div>
              </div>
            ))
          )}
        </div>

        {/* Add member form */}
        {usersToAdd.length > 0 && (
          <div className="pt-4 border-t border-gray-200">
            <h3 className="text-sm font-medium text-gray-700 mb-3">Add Member</h3>
            <div className="flex gap-2">
              <div className="flex-1">
                <Select
                  options={usersToAdd.map((user) => ({
                    value: user.id,
                    label: `${user.name} (${user.email})`,
                  }))}
                  value={selectedUserId}
                  onChange={(e: React.ChangeEvent<HTMLSelectElement>) => {
                    setSelectedUserId(e.target.value);
                  }}
                  placeholder="Select a user..."
                  fullWidth
                  disabled={isAdding}
                />
              </div>
              <div className="w-32">
                <Select
                  options={roleOptions}
                  value={selectedRole}
                  onChange={(e: React.ChangeEvent<HTMLSelectElement>) => {
                    setSelectedRole(e.target.value as TeamMemberRole);
                  }}
                  fullWidth
                  disabled={isAdding}
                />
              </div>
              <Button
                variant="primary"
                onClick={handleAddMember}
                disabled={!selectedUserId || isAdding}
              >
                {isAdding ? "Adding..." : "Add"}
              </Button>
            </div>
          </div>
        )}
      </CardContent>
    </Card>
  );
}